Home network. Both computers must be running. Why?

I have a home network. I have a Linux box near the ADSL input. The ADSL
goes to a modem in bridge mode, then a router. The modem and router run
continuously. ALL the PPPoE is handled on that side of things.

The router has an ethernet input, an ethernet output to my box, and a
wireless output to my wife's laptop in another room, running XP. After the
router, the two paths have nothing in common.

If the laptop is switched off, I can access the Internet O.K. But if my
computer is not running, my wife cannot access the Internet.

Why?

Doug.
--
Who does the best his circumstance allows,
Does well, acts nobly; angels could no more.
- Edward Young.

Doug Laidlaw wrote:
> I have a home network. I have a Linux box near the ADSL input. The ADSL
> goes to a modem in bridge mode, then a router. The modem and router run
> continuously. ALL the PPPoE is handled on that side of things.
>
> The router has an ethernet input, an ethernet output to my box, and a
> wireless output to my wife's laptop in another room, running XP. After the
> router, the two paths have nothing in common.
>
> If the laptop is switched off, I can access the Internet O.K. But if my
> computer is not running, my wife cannot access the Internet.
>
> Why?
>
> Doug.

Where is the laptop getting it's IP address from?

Are you running a dhcp server on your linux box?

Could it be possible you are using your linux box as a gateway?

chris dewbery wrote:

> Doug Laidlaw wrote:
>> I have a home network. I have a Linux box near the ADSL input. The ADSL
>> goes to a modem in bridge mode, then a router. The modem and router run
>> continuously. ALL the PPPoE is handled on that side of things.
>>
>> The router has an ethernet input, an ethernet output to my box, and a
>> wireless output to my wife's laptop in another room, running XP. After
>> the router, the two paths have nothing in common.
>>
>> If the laptop is switched off, I can access the Internet O.K. But if my
>> computer is not running, my wife cannot access the Internet.
>>
>> Why?
>>
>> Doug.
>
> Where is the laptop getting it's IP address from?
>
> Are you running a dhcp server on your linux box?
>
> Could it be possible you are using your linux box as a gateway?

I am not entirely sure. The modem is set to be 192.168.0.1.
The router is set to be 192.168.1.1, and I thought that it allocated IP
addresses to the network.
My box is 192.168.1.2 and uses DHCP.
The laptop is 192.168.1.3, but I couldn't get behind XP's GUI to find out
what was really happening.
I had just assumed that because the branching out occurred at the router, my
box was "below" the router and could be taken out with no effect on other
branches of the network (even if there is only one other.)

(I was intending to run a Web server on my box. Then it would have to be on
continuously anyway.)

Doug.
--
For there was never yet philosopher
That could endure the toothache patiently.
- Shakespeare (Much Ado About Nothing).

To "get behind" XP's gui, open a command prompt and type "ipconfig
/all". It'll tell you the IP address of the DHCP server it obtained the
lease from.

....kut

Doug Laidlaw wrote:
> chris dewbery wrote:
>
>> Doug Laidlaw wrote:
>>> I have a home network. I have a Linux box near the ADSL input. The ADSL
>>> goes to a modem in bridge mode, then a router. The modem and router run
>>> continuously. ALL the PPPoE is handled on that side of things.
>>>
>>> The router has an ethernet input, an ethernet output to my box, and a
>>> wireless output to my wife's laptop in another room, running XP. After
>>> the router, the two paths have nothing in common.
>>>
>>> If the laptop is switched off, I can access the Internet O.K. But if my
>>> computer is not running, my wife cannot access the Internet.
>>>
>>> Why?
>>>
>>> Doug.
>> Where is the laptop getting it's IP address from?
>>
>> Are you running a dhcp server on your linux box?
>>
>> Could it be possible you are using your linux box as a gateway?
>
> I am not entirely sure. The modem is set to be 192.168.0.1.
> The router is set to be 192.168.1.1, and I thought that it allocated IP
> addresses to the network.
> My box is 192.168.1.2 and uses DHCP.
> The laptop is 192.168.1.3, but I couldn't get behind XP's GUI to find out
> what was really happening.
> I had just assumed that because the branching out occurred at the router, my
> box was "below" the router and could be taken out with no effect on other
> branches of the network (even if there is only one other.)
>
> (I was intending to run a Web server on my box. Then it would have to be on
> continuously anyway.)
>
> Doug.

Kurt wrote:

> To "get behind" XP's gui, open a command prompt and type "ipconfig
> /all". It'll tell you the IP address of the DHCP server it obtained the
> lease from.
>
> ...kut
>
> Doug Laidlaw wrote:
>> chris dewbery wrote:
>>
>>> Doug Laidlaw wrote:
>>>> I have a home network. I have a Linux box near the ADSL input. The
>>>> ADSL
>>>> goes to a modem in bridge mode, then a router. The modem and router
>>>> run
>>>> continuously. ALL the PPPoE is handled on that side of things.
>>>>
>>>> The router has an ethernet input, an ethernet output to my box, and a
>>>> wireless output to my wife's laptop in another room, running XP. After
>>>> the router, the two paths have nothing in common.
>>>>
>>>> If the laptop is switched off, I can access the Internet O.K. But if
>>>> my computer is not running, my wife cannot access the Internet.
>>>>
>>>> Why?
>>>>
>>>> Doug.
>>> Where is the laptop getting it's IP address from?
>>>
>>> Are you running a dhcp server on your linux box?
>>>
>>> Could it be possible you are using your linux box as a gateway?
>>
>> I am not entirely sure. The modem is set to be 192.168.0.1.
>> The router is set to be 192.168.1.1, and I thought that it allocated IP
>> addresses to the network.
>> My box is 192.168.1.2 and uses DHCP.
>> The laptop is 192.168.1.3, but I couldn't get behind XP's GUI to find out
>> what was really happening.
>> I had just assumed that because the branching out occurred at the router,
>> my box was "below" the router and could be taken out with no effect on
>> other branches of the network (even if there is only one other.)
>>
>> (I was intending to run a Web server on my box. Then it would have to be
>> on continuously anyway.)
>>
>> Doug.

Thanks Kurt. That says that the server and gateway are 192.168.1.1, which
is the router.

Doug.
--
If a thing is worth doing, it is worth doing badly.
- G.K. Chesterton.